WO1989005548A1

WO1989005548A1 - Receiver

Info

Publication number: WO1989005548A1
Application number: PCT/JP1988/001203
Authority: WO
Inventors: Kazuhiko Kubo; Akira Usui; Minoru Ueda
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 1987-11-30
Filing date: 1988-11-29
Publication date: 1989-06-15
Also published as: GB2224912B; KR890702343A; GB2224912A; US5093922A; DE3891107C1; JPH01143526A; KR930001194B1; GB8916852D0; JP2563401B2

Abstract

A converter or a tuner for the double-super heterodyne reception of satellite broadcasting by using a CATV system. The converter or the tuner (2) has a first frequency conversion unit of the type of up-converter and a second frequency conversion unit of the type of down-converted. The first frequency conversion unit is provided with a converted output terminal for producing output to a BS tuner (5). A general CATV signal received from the CATV facility (1) is passed through the first and second frequency conversion units, and the converted signal is sent to a TV set (3). On the other hand, the BS signals are converted into an UHF band or the super-high band and then into BS-IF signals through the first frequency conversion unit, and are sent to the BS tuner (5) via the converted output terminal.

Description

Details

Title of the invention Technical field

The present invention relates to a receiving device such as a CATV converter or a television tuner for receiving a satellite broadcast program transmitted over a cable.

冃 Technique 1 / Γ

In recent years, with the rise of new media], satellite broadcasting, CATV, etc. have become common. Therefore, as a system for receiving satellite broadcasting, a parabolic antenna is installed in each home, and the received signal, for example, a 4 GHz band signal is converted by a frequency converter called a BS converter) 1-0 GHz to 1.3 GHz It is common to convert the signal to a band intermediate frequency signal (BS-IF signal), pull it indoors, and receive it with a BS tuner. Due to the development of CATV]), the super-high band or UHF band of the television band is used for several channels on the BS 1 channel, and the FM signal of the satellite broadcasting is used. Is being implemented. In this case, the receiving system generally converts the cable signal into a BS-IF signal using an upconverter, and supplies the output to a BS tuner to receive the signal.

Hereinafter, the conventional receiving apparatus as described above will be described with reference to the drawings.

Fig. 1 shows a conventional satellite broadcasting reception system using cables. In Fig. 1, 1 is a CATV facility, 21 is a CATV facility 1 The CATV converter that converts the frequency of the CATV signal output from the CATV facility, 3 is the TV set, 4 is the BS upconverter that converts the frequency of the CATV signal output from the CATV facility 1, 5 is the BS tuner, and the output signal is Supplied to TV set 3.

The operation of the receiving apparatus configured as described above will be described below. In Figure 1, CATV facility 1! ) Of the sent cable signal, 6 MHz band signal in general is frequency converted to a constant R _F Ji Ya N'ne Le signal in CATV co Npaku ² 1, is input to the TV set 3. On the other hand, the BS-IF signal converted to a super high band or UHF band at CATV facility 1 is upconverted by the upconverter 4), and 1.0 (frequency in the 3Hz to i.3GHz band). Is converted to a UHF 13 channel or is output as an audio signal / video signal in the BS tuner 5, and is input to the TV set ³ and is input to the TV set ^3. In the case of an all-punch tuner-type receiver, the converter 21 is omitted.

However, as described above, an upconverter ⁴ is required separately to receive a BS-IF signal converted to a super-high band or UHF band.]? Had the problem of getting up.

SUMMARY OF THE INVENTION An object of the present invention is to provide a receiver capable of achieving a great cost reduction without using a separate converter.

Disclosure of the invention

In order to achieve this object, the receiving apparatus of the present invention has a first circuit. Using a double-spar type converter or tuner including a wave number converter and a second frequency converter, a comparator output for input to the BS tuner at the output end of the first frequency converter. Provide a terminal and convert to UHF band or super-high band

5 The BS signal obtained is input to the first frequency converter via a cable, the frequency is converted, the BS-IF signal is output from the output terminal of the first frequency converter, and no separate up-converter is used. BS-The IF signal is supplied to the BS tuner.

With this configuration, the converter or tuner can have an up-converter function, and it is not necessary to add an additional up-converter. Achieve cost down.

BRIEF DESCRIPTION OF THE FIGURES

Fig. 1 is a block diagram showing the configuration of a conventional receiver, and Fig. 2 is

15 A block diagram of the receiving apparatus according to one embodiment of the present invention, FIG.

FIG. 2 is a block diagram of a main part of FIG.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the overall configuration of a receiving apparatus according to an embodiment of the present invention. In Fig. 1, 1 is a CATV facility, which receives a television signal in the 6 MHz band and satellite broadcasting, and uses several channels for Super High Band or UHF. Outputs the BS-IF signal converted to the band. ² is a double super 5 type converter, which receives the output signal from the CATV facility 1. Power. 3 is a TV set, 5 is a 1.0 to "!! BS tuner for inputting signals in the .3 GHz band. Teleset 3 has a built-in double super tuner that can receive CA TV In this case, converter 2 is omitted.

The operation of the receiving apparatus configured as described above will be described below. CATV reception available in converter 2 or television set 3 3 The double super tuner has a converter output terminal. The BS-IF signal output from the CA TV facility 1 and converted to a super-high band or UHF band is converted to 1 oGHz to 1.3 GHz by the double super-type computer 2 or tuner. The frequency is converted, and the resulting audio signal and video signal are input to the BS tuner 5 and input to the respective input terminals of the television set 3.

Next, FIG. 2 will be described. FIG. 2 shows a configuration of a tuner section capable of receiving CATV signals incorporated in the converter ² or the TV set 3 configured by the ^double super system shown in FIG. The following is basically the same for a converter and a converter showing the configuration of a double super tuner. 1 1 to ¹ 3 Ru different respective pass frequency input BPF, 1 4 broadband RF amplifier in FIG. 2, 1 5 first mixer, ¹ 6 the first local oscillator frequency variable 1 7 first IF An amplifier, 18 is a BPF, 19 is a second mixer, 20 is a second local oscillator with a fixed oscillation frequency, 22 is a second IF amplifier, 24 is a prescaler, and 25 is an amplifier. It is a pedance converter. The operation of the tuner configured as described above will be described below. In Fig. 2, 11, 12, and 13 are input BPFs provided for each band (for example, VHF low band VL and mid band, VHF high band VJJ and super high band, UHF). is there. The signal input through the BPFs 11, 12, and 13 is amplified by the broadband RF amplifier 14 and input to the first mixer 15. The output signal of the broadband RF amplifier ¹⁴ is mixed with the first local oscillation signal of the local oscillator 16 in the first mixer 15; T is extracted as the first IF signal. The IF signal is amplified by the first IF amplifier 17, only the first IF signal is selected by the BPF 18, and is input to the second mixer 19. This first IF signal is output from the second local oscillator 2O. The second local oscillation signal is mixed with the second mixer 19 to obtain a difference component as a second IF signal, for example, an intermediate frequency signal of 58.75 MHz. The signal is output as a ^second IF output signal to terminal B. The first local oscillator 1 is supplied with a tuning voltage from terminal F to J9, and is also supplied to prescaler 14 by? 1 local oscillator. 16 Divides the local oscillation signal of 6 and supplies its output to terminal E. The above configuration is a double-spar tuner. Or a converter configuration!), Which is advantageous for multi-channel reception such as CATV and wideband reception.

Next, consider the case where a BS-IF signal converted to the UHF band is input to terminal A. For example, the frequency relationship is as follows. — Ό—

Channel BS—I 5 * frequency (MHz) UHF frequency (MHz) B S—1 1035.98 ~ End 38.52 ~

1062.98 End 65.52

B S— 1 5 1 304 .50〜 4TO. O 〜

. 1 331 .50 4ΘΤ O That is, in this case, the "by setting the local oscillation frequency to ^{1 8} 〇 ¹ .5MHz, Appuko damper Ichito is as an output signal of the first mixer 1 5 - The BS When the BS-IF signal is converted to a super-high band, the first local oscillation frequency is about 1 SOO MHz.

- How, normal VHF b Pan de, selected on VHF Hai Van de or 9 5 O MH _Z as an example the frequency of the 1 IF signal as a double super tuner 'for receiving a portion of the signal of the UHF Pando Then The required range of the first local oscillation frequency is 1Ο4θ 1 to 1772 O MHz, and the required local oscillation frequency is required for the CATV channel regardless of whether it is transmitted in the above UHF or super high band. It is within the variable range of the oscillation frequency. Also, if the NTSC system TV signal and the BS-IF signal have different jast ports-cal points, it may be added to the channel selection program.

A full I filter ¹ 2 When this good urchin input signal from terminal A scan one Pahai bands, passes, respectively it off I filter ¹ 3 when the UH F bands, R F. amplifier ¹ 4 Is passed to the ^first mixer ¹⁵ and is mixed with the above-mentioned first local oscillation signal, and is frequency-converted as a mixer output. A regular BS-IF signal (1. OGHZ to 1.3 GHz) Force S appears. The BS - IF signal fin peak - through the dancing converter ² 5 The signal is output to terminal G and input to the IF input terminal of BS tuner ^{5 by} a cable or the like. Contact, if the output y down impedance is approximately 7 ⁵ i2 of the first mixer 1 5, Lee down impedance converter 1 5 may be omitted. Also, the sum component appearing at the output of the first mixer 15

As for 5, there is no problem because it is attenuated by a low-pass filter (not shown) in the BS tuner input section.

As described above, according to the present embodiment, a double-spar type converter ² or a tuner of the same type is employed, and the output terminal G of the ^first mixer ¹⁵ is provided with the block comparator output terminal G. 9] io A system that can receive BS-IF signals transmitted via cable without using an upconverter can be created.

Industrial applicability

As described above, the present invention provides a double super-converter as a converter or a tuner for receiving a cable-transmitted BS-IF signal.

By adopting the 15-system and providing a converter output terminal at the output end of the first mixer, it is not necessary to attach an external upconverter as in the past, and the configuration is greatly improved. It can be simplified, can be inexpensive and can be a small receiving system, and its practical effect is great.

0

Five

Claims

' The scope of the claims

1. A first frequency converter, the receiving apparatus further comprising a second frequency conversion section for frequency-converting the ^first output signal of the frequency converter, as an input signal of the first frequency converter A signal including a BS signal converted into a televibund is input to a CATV cable, and a signal is output to the output side of the first frequency conversion section separately from an input path to the second frequency conversion section. BS—This is a receiver that outputs an IF signal.

2. The receiving device according to claim 1, wherein a BS-IF signal converted into a sand band or a UHF band of a television band is transmitted through a cable and input.

3. The first frequency converter is an up converter! The receiving device according to claim 5, wherein the second frequency conversion unit is a down converter.

4. The receiving device according to claim 1, wherein an impedance converter is connected to an output side of the first frequency conversion unit, and a output terminal of the impedance converter is connected to a output terminal of the first frequency conversion unit. apparatus.

5. The receiving apparatus according to claim ^1, wherein the first direct co lymph one preparative output terminal to the output terminal of the frequency converter and 0 connection.

6. The first frequency converter has a filter at the input stage to separate and extract the VHF band and mound signals, the VHF band and superband signals, and the UHF band signals. The receiving device according to claim 1.

Five